Electrical resistivity of TiB2/C composite cathode coating for aluminum electrolysis

1INTRODUCTIONThere are many disadvantages in the presentHall-Heroult electrolytic process[1],such as highenergy consumption,low unit productivity and se-rious environmental pollution and so on,especiallythe high energy consumption of per ton alumin-ium,which ranges from13MW·h to15MW·h,and the energy efficiency is less than50%[2].Therefore,low-energy consumption aluminumre-duction cell has been a research focus for interna-tional aluminum companies and institutes.Thedrained cathode cel…     

基于SSH2的C2C系统安全策略

随着互联网的不断发展,以J2EE（Java 2 Platform Enterprise Edition）为代表的网络开发技术占据了Windows,Linux,Unix平台下大部分的市场份额.Java以平台无关性和安全性著称,然而面对不断更新的Web技术和不断升级的网络环境,安全问题仍然是J2EE开发不容忽视的问题.SSH2（Struts2 Spring Hibernate）作为Java WEB主流框架的整合,其安全控制策略至关重要.结合三农电子商城开发经验,从B/S（Browser/Server）3层体系结构出发,分层讨论C2C（Customer to Customer）系统的安全保证策略.     

Effect of TiB2 content on resistance to sodium penetration of TiB2／C cathode composites for aluminium electrolysis

TiB2/C cathode composites with various contents of TiB2 were prepared and their characterizations were observed and compared. The expansion of samples due to sodium and bath penetration was tested with a modified laboratory Rapoport apparatus and the appearances of the cut sections of specimens after electrolysis were studied.The results show that the mass of TiB2/C cathode composites with mass fraction of TiB2 less than 70% appreciably increases, but that of the composites with mass fraction of TiB2 more than 70% decreases slightly after being baked.The resistance to sodium and bath penetration of TiB2/C cathode composites increases with the increase of TiB2 content, especially in the composites with high TiB2 content. TiB2/C cathode composites have high resistance to the penetration of sodium and bath as well as good wettability by molten aluminum, and keep integrality and have little change of appearance after electrolysis, which indicates that TiB2/C cathode composites can be used as inert wettable cathode for aluminum electrolysis.     

The Hot Corrosion Performance of NiCr-Cr3 C2 Cermet Coating to Boiler Tube

Three kinds of NiCr-Cr3 C2 cermet coatings were designed and deposited by the subsonic velocity flame spraying, and their performances of hot corrosion performance were evaluated in comt)arison with 102G,20G boiler tube steel, FeCrAl, NiCrTi, Ni5OCr and NiCrAIMoFe-Cr3 C2 coatings, which are widely used at present for protection of boiler tubes. Meanwhile, the influence of sealer on the hot corrosion resistance of warious coatings and the mechanisms of coating corrosion were explored.     

Effect of infiltrating Si on friction properties of C/C composites

In order to improve the friction-wear properties of the C/C composites for aircraft brake pairs, the friction behavior of samples with infiltrating Si was investigated. The influence of Si smearing thickness on friction properties was studied in detail. The results show that with the increase of Si smearing thickness and β-SiC content, the friction coefficient reduces from 0. 40 to 0. 30; the linear wear of stators increases from 2. 0 μm to 18. 9 μm per cycle, and that of rotors increases from 1. 4μm to 22. 6 μm per cycle; mass wear of stators increases from 20. 6 mg to 126. 9 mg per cycle, and that of rotors increases from 13. 7 mg to 166. 2 mg per cycle. On the other hand, when a large number of inhomogeneous β-SiC particulates are performed, friction surfaces of the samples flake off layer by layer and many nicks are observed.     

C2C网上商城信用评价体系比较研究

信用评价体系是C2C网上商城良好运作和发展的重要保障。本文通过对淘宝、易趣、拍拍和有啊四家C2C网上商城的信用评价体系进行对比,从认证要求、评价标准及评价计分规则等五个方面总结现行评价体系的特点,指出存在的具体问题并给出予以改进的五项意见和建议。     

C2C交易模式下卖家信用影响因素实证研究

在C2C电子商务中,由于买卖双方信息的不对称性,使得信任缺失成为其快速发展的主要障碍。从网络卖家、购物网站、商品、电子商务环境和消费者五个方面探讨了C2C交易模式下卖家信用的影响因素。对合肥市网络消费者进行问卷调查,实证研究各因素的影响程度。研究结果显示,卖家的信誉与知名度和卖家提供的服务、配送对卖家信用的影响程度尤为突出,电子商务环境、商品质量、网站的安全性也是比较重要的影响因素,消费者的网上购物经验和个人信任倾向影响程度最小。     

High temperature behaviors of high velocity arc sprayed Fe-Al/Cr3C2 composite coatings

Fe-Al/Cr3C2 composite coatings were manufactured using high velocity arc spraying （HVAS） technology. The high temperature erosion, wear and corrosion resistance of the coatings were investigated. The coating properties such as bonding strength, porosity, hardness as well as microstructures were characterized. The results show that the coatings have relatively high heat tremble bond strength, hardness, and typical layer-shaped coatings＇ microstructures. With the rise of temperature, the coating erosion resistance increases too; the impingement angel does effects on erosion properties, and the erosion mechanism changes from ductile to brittle behaviors at 450℃. The coatings have good room temperature wear resistance and relatively good high temperature resistance. The wear mechanism of the coatings is peeling wear behavior. The coatings have excellent high temperature corrosion resistance because of the produce of oxides during corrosion.     

Erosion-Corrosion Behaviors of High Velocity Arc Sprayed Fe-Al/Cr3 C2 Coating

1 IntroductionArc Spraying (AS) is a technique that utilizes anelectric arc as the heat source to melt wires into droplets ,which are subsequentlysprayed ontosubstrates bytheflowof compressed air . High Velocity Arc Spraying (HVAS)technology was developed on the basis of AS. Aspecialtube designed according to the principle of aerodynamicswas mounted at the exit of compressed air .Thenthe hightemperature fuel air or compressed air was accelerated bythe tube .Hence ,a higher velocityand be…     

Influence of oxides on high velocity arc sprayed Fe-Al／Cr3C2 composite coatings

Fe-Al/Cr3C2 coatings were sprayed on low steel by high velocity arc spraying(HVAS) technology. The influences of oxides on erosion, corrosion and wear behavior for high velocity arc sprayed Fe-Al/Cr3C2 coatings were studied. The results show that HVAS-sprayed Fe-Al/Cr3C2 coatings have good erosion, heat corrosion and wear resistance. The erosion resistance improves with the increase of the temperature. On one hand, the ferrous oxides are incompact, so they peel off the surface of the coatings easily during the high temperature erosion. On the other hand, compact Al2O3 films on the surface can protect the coatings.     

C2C电子商务第三方信用评价系统的构建

我国C2C电子商务网站如淘宝、易趣、拍拍网等都各自建立了信用评价系统,在一定程度上对消费者和商家的失信行为起到了抑制作用.但是,当前各网站信用评价系统还存在各自为政、信用孤岛、信用评价标准不统一等问题.阐述了建立第三方信用评价系统的必要性,分析了C2C电子商务第三方信用评价系统的功能,并在此基础上构建了第三方信用评价系统的结构和运行流程.     

Effect of Electron Beam on the Structure and Crystallization Features of BaO-SrO-TiO2-SiO2 Glass

Glasses of BaO-SrO-TiO2-SiO2 after electronic radiation treatment of 50-1000 kgy were studied by means of IR spectra, DTA and visible light absorption method. The result shows that the glass structure is changed due to the formation of structue defect from oxygen vacancy and E‘color center, which resultsd in the crystallization process and new precursors, and decreasement of Tg temperature and crystallization peaks by 20 -50℃.     

B2C电子商务企业市场竞争策略研究

信息技术和计算机技术的发展,为网络营销的发展提供了一个良好的发展机遇。在日趋激烈的网购竞争中,主要分析作为B2C购物网站应如何使消费者获得最佳的营销体验,并希望借此对国内其他网络购物网站带来借鉴意义。本文提出一个较为可靠和可行的营销策略,如建立消费者信任、改善服务质量、保护消费者信息以提高其在未来电子商务领域中的竞争力。同时,这种思路也可以启发国内电子商务平台,来增强自己的竞争力,更好面对国外的竞争对手。     

随机DEA模型C2GS2和一个结论

阐述了当数据存在统计扰动时 ,DEA模型 C2 GS2就是一种随机线性规划模型 ,并证明了其最优值分布的无缺陷性     

互联网直销的C2M模式分析

针对直销模式向"互联网+直销"转型中存在的若干问题,将C2M理论引入"互联网+直销"模式中,提供一种直销模式向互联网转型的新思路,有效解决生产商低成本、高利润与消费者的低价格、个性化、高品质需求之间的矛盾.     

ZIF-8体系富集回收炼厂干气中C2H6+C2H4

炼油工业作为一个能量密集型工业,对炼厂干气中轻烃组分气体进行有效回收且利用,将同时解决其一直面临的节能及环保两大难题.采用吸附法以及吸附-水合法分离含有C2(即C2H6+C2H4)的模拟炼厂干气M1:C2H6(11.55％)+C2H4(12.46％)+CH4(29.15％)+N2(27.02％)+H2(19.82％),...     

Initial corrosion behaviors of AZ91 magnesium alloy in the presence of SO2

The effects of SO2 on the initial atmospheric corrosion of AZ91D magnesium alloy were investigated in laboratory. Met-allographic observation, SEM (Scanning Electron Microscopy), XRD (X-ray Diffraction) and XPS (X-ray Proton Spectrograph) were used to analyze and discuss the initial surface morphology of corrosion layers and corrosion products. The corrosion rate of the alloy increases with increasing the content of SO2. The initial attack has the characteristics of localized corrosion and preferentially concentrates on a phase. MgO and Mg(OH)2 form at first, which provide a protective layer, then the existence of SO2 decreases the pH of the thin solution on the alloy, accelerates dissolution process, and promotes the formation of MgSO3·6H2O and MgSO4·6H2O, meanwhile cracks were found on the corrosion products with corrosion continuation. These soluble corrosion products and the cracks provide the paths for filtering oxygen and corrosion pollutants into the matrix, which results in severe localized co     

C2C电子商务模式中信息不对称的博弈分析

在C2C电子商务交易模式中,交易双方存在着信息不对称,严重影响网络交易效率.针对卖家与消费者之间存在的的信息不对称问题,运用博弈论方法,通过建立信号博弈模型,分析C2C电子商务交易中的信任问题,提出促使卖家诚信经营的对策.     

The Design and Realization of C Decompiler

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